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Cyclization of the arylazo cyanoacatate derivative 3 with active methylene compounds and β-dinitriles; formation of substituted pyrans, pyridines and pyridazines.
Reaction conditions: (a) acetylacetone/dioxane/Et3N/∆; (b) acetoacetanilde/dioxane/Et3N/∆; (c) ethyl acetoacetate, ethyl benzoylacetate, and/or ethyl caynoacetate/dioxane/Et3N/∆; (d) malononitrile/dioxane/Et3N/∆.
